Re: 4 blade vs 3 blade prop
I went from a 18D24P cupped 3 blade to a 18D20P Supercup 4 Blade and saw less cavitation, slightly higher speed and would do it again. Cost is higher but worth it. This is a 23 Inboard with a Cummins 250HP Diesel with 2800RPM top and 1.5/1 trans. Placed my faith in the San Diego dealer and he picked the perfect match. Drive seems a little quieter but may be suggestive thinking.
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